Solenoid graduating-tube.



Patented Nov. 5, Hill.

No. 686,l37.

U. G. ROGERS. SOLENOID EBADUATING TUBE. (Application filed Kay 24,1901.)

(No Model.)

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UNITED STATES PATENT OFFICE.

ULYSSES G. ROGERS,

OF YORK, N. Y.

SOLENOID GRADUATlNG-TUBE.

SPECIFICATION forming part of Letters Patent No. 686,137, dated November5, 1901.

Application filed May 24, 1901. Serial No. 61,792. (No m'odeL) To allwhom it may concern:

Be it known that I, ULYSSES Gr. ROGERS, a citizen of the United Statesof America, and a resident of New York city, county and State of NewYork, have invented certain new and useful Improvements in Bead-HeadedTubes, of which the following is a specification.

My invention relates more particularly to bead-headed insulating-tubessuch as are used in solenoid-magnets for graduating the magneticattraction by shifting it along the core as a cover thereto forintercepting the magnetic influences between the core and the energizedcoil of the magnet more or less to regulate the strength of the same,the head being employed for the handle by which to manipulate thetube,as hereinafter described, reference being made to the accompanyingdrawings, in which- Figure 1 is a side View of my improved solenoid-coretube. Fig. 2 is a side View of the instrumentalities employed forproducing the head and a longitudinal section of a tube in process ofthe formation of the head,

A represents the plain body of the tube, and 1) represents the head,said head being spun from the inside outward and projected as a bead,and preferably knurled or milled on the surface for better hold in thegrip of the fingers. In producing such heads I employ a tool consistingof the milled head 8, carried on the end of a stem 01, such as may beinserted in the jaws of a lathe-chuck and be rotated thereby, said stembeing smaller than the head and the diameter of the head being suchrelatively to the tube on which the head is to be produced that it canenter the bore of the tube to begin with, and together with suchinternal tool I employ for the outside effect a rotatory grooved spinnere, carried in the forks of a staff f, which is to be carried in thetool-holder of the cross-slide of the lathe suitably for spinning up thebead Z on the tube near one end when said end is suitably placed on themilled head 0. The end is thus expanded, so as to form a suitable headI), and though formed over and contracted on the rounded sides of theforminghead 0 offers no resistance to removal of the completed head ofthe tube from the forminghead. A tube having such a head is producedcheaper than as commonly made by fitting on a ring or upsetting the endof the tube.

What I claim as my invention is The article of manufacture consisting ofa headed solenoid graduating tube, said head consisting of anoutwardly-expanded spun bead-rib formed near one end.

Signed at New York city this 21st day of May, 1901.

ULYSSES G. ROGERS Witnesses:

O, SEDGWIoK, J. M. HOWARD,

